简单的SQL查询，合并结果并划分 [英] simple sql query, combine results and divide

问题描述

我正在尝试从 2个表中获得 2个计数，并计算出与MySQL数据库类似的百分比:

I'm trying to get 2 counts from 2 tables and work out the percentage like for a MySQL db:

1. select field_one, count(*) as COUNT_ONE from table1 group by field_one;

select other_field,count(*) as COUNT_TWO from table2 group by other_field;

我想合并结果，并用FINAL_COUNT=(COUNT_ONE/COUNT_TWO) * 100表示百分比?

I want to combine the results and have FINAL_COUNT=(COUNT_ONE/COUNT_TWO) * 100 for percentage ?

推荐答案

快速又肮脏:

select (a.count_one / b.count_two) * 100 as final_count from 
(select field_one, count(*) as count_one from table1 group by field_one) a,
(select field_two, count(*) as count_two from table2 group by field_two) b
where a.field_one = b.field_two

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